Here is the full list of all 13 AVSEQ achievements.
Detonate 250 max length chains
Place 500 notes
Complete all stages
All stages unlocked
Complete a stage without any atoms hitting the bottom
Place 250 notes
Detonate 10 max length chains
Place 100 notes
Unlock half the stages
Detonate 50 max length chains
Place 50 notes
Complete a stage without losing any notes from the grid